Re: [PATCH 06/12] drm/client: Constify modes

[kernel test robot <lkp@intel.com>]

Hi Ville,

kernel test robot noticed the following build errors:

[auto build test ERROR on drm-misc/drm-misc-next]
[also build test ERROR on drm-intel/for-linux-next drm-intel/for-linux-next-fixes drm-tip/drm-tip linus/master v6.9-rc2 next-20240405]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Ville-Syrjala/drm-client-Fully-protect-modes-with-dev-mode_config-mutex/20240405-043540
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20240404203336.10454-7-ville.syrjala%40linux.intel.com
patch subject: [PATCH 06/12] drm/client: Constify modes
config: hexagon-allyesconfig (https://download.01.org/0day-ci/archive/20240407/202404070528.NgbaKKH3-lkp@intel.com/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project 546dc2245ffc4cccd0b05b58b7a5955e355a3b27)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240407/202404070528.NgbaKKH3-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202404070528.NgbaKKH3-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/gpu/drm/drm_client_modeset.c:16:
   In file included from include/drm/drm_atomic.h:31:
   In file included from include/drm/drm_crtc.h:32:
   In file included from include/drm/drm_modes.h:33:
   In file included from include/drm/drm_connector.h:32:
   In file included from include/drm/drm_util.h:35:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/hexagon/include/asm/io.h:328:
   include/asm-generic/io.h:547:31: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
     547 |         val = __raw_readb(PCI_IOBASE + addr);
         |                           ~~~~~~~~~~ ^
   include/asm-generic/io.h:560:61: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
     560 |         val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
         |                                                         ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
      37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
         |                                                   ^
   In file included from drivers/gpu/drm/drm_client_modeset.c:16:
   In file included from include/drm/drm_atomic.h:31:
   In file included from include/drm/drm_crtc.h:32:
   In file included from include/drm/drm_modes.h:33:
   In file included from include/drm/drm_connector.h:32:
   In file included from include/drm/drm_util.h:35:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/hexagon/include/asm/io.h:328:
   include/asm-generic/io.h:573:61: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
     573 |         val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
         |                                                         ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
      35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
         |                                                   ^
   In file included from drivers/gpu/drm/drm_client_modeset.c:16:
   In file included from include/drm/drm_atomic.h:31:
   In file included from include/drm/drm_crtc.h:32:
   In file included from include/drm/drm_modes.h:33:
   In file included from include/drm/drm_connector.h:32:
   In file included from include/drm/drm_util.h:35:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/hexagon/include/asm/io.h:328:
   include/asm-generic/io.h:584:33: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
     584 |         __raw_writeb(value, PCI_IOBASE + addr);
         |                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:594:59: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
     594 |         __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
   include/asm-generic/io.h:604:59: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
     604 |         __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
   In file included from drivers/gpu/drm/drm_client_modeset.c:16:
   In file included from include/drm/drm_atomic.h:31:
   In file included from include/drm/drm_crtc.h:32:
   In file included from include/drm/drm_modes.h:33:
   In file included from include/drm/drm_connector.h:32:
   In file included from include/drm/drm_util.h:36:
   In file included from include/linux/kgdb.h:19:
   In file included from include/linux/kprobes.h:28:
   In file included from include/linux/ftrace.h:13:
   In file included from include/linux/kallsyms.h:13:
   In file included from include/linux/mm.h:2208:
   include/linux/vmstat.h:522:36: error: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Werror,-Wenum-enum-conversion]
     522 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   In file included from drivers/gpu/drm/drm_client_modeset.c:1241:
>> drivers/gpu/drm/tests/drm_client_modeset_test.c:108:7: error: assigning to 'struct drm_display_mode *' from 'const struct drm_display_mode *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
     108 |         mode = drm_connector_pick_cmdline_mode(connector);
         |              ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8 errors generated.


vim +108 drivers/gpu/drm/tests/drm_client_modeset_test.c

8fc0380f6ba7e9 Maxime Ripard 2022-11-14   84  
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   85  static void drm_test_pick_cmdline_res_1920_1080_60(struct kunit *test)
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   86  {
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   87  	struct drm_client_modeset_test_priv *priv = test->priv;
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   88  	struct drm_device *drm = priv->drm;
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   89  	struct drm_connector *connector = &priv->connector;
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   90  	struct drm_cmdline_mode *cmdline_mode = &connector->cmdline_mode;
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   91  	struct drm_display_mode *expected_mode, *mode;
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   92  	const char *cmdline = "1920x1080@60";
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   93  	int ret;
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   94  
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   95  	expected_mode = drm_mode_find_dmt(priv->drm, 1920, 1080, 60, false);
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   96  	KUNIT_ASSERT_NOT_NULL(test, expected_mode);
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   97  
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   98  	KUNIT_ASSERT_TRUE(test,
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   99  			  drm_mode_parse_command_line_for_connector(cmdline,
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  100  								    connector,
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  101  								    cmdline_mode));
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  102  
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  103  	mutex_lock(&drm->mode_config.mutex);
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  104  	ret = drm_helper_probe_single_connector_modes(connector, 1920, 1080);
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  105  	mutex_unlock(&drm->mode_config.mutex);
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  106  	KUNIT_ASSERT_GT(test, ret, 0);
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  107  
8fc0380f6ba7e9 Maxime Ripard 2022-11-14 @108  	mode = drm_connector_pick_cmdline_mode(connector);
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  109  	KUNIT_ASSERT_NOT_NULL(test, mode);
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  110  
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  111  	KUNIT_EXPECT_TRUE(test, drm_mode_equal(expected_mode, mode));
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  112  }
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  113  

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